214 The Rev. W. Conybeare on 



in the west of Derry, is seen at the distance of three nniles Inland ; 

 it is remarkable for the grandeur of the scenery presented by its 

 shattered precipices. 



Of the island of Rathlin or Raghery, the section represents only 

 the cliffs extending from its most westerly promontory to the centre 

 of its southern line of coast. From the point where the section ter- 

 minates, the precipices round the southern cape and the eastern and 

 northern shores are exclusively composed of basalt, and frequently 

 present columnar groups. (See page 182.) 



To the conjecture of Dr. Berger, however, that sandstone and 

 older rocks exist at no great depth in the south-eastern quarter of 

 the island. (See page 151.) the positive assertion of Mr. Hamilton 

 must be considered as adding great weight. " An heterogeneous 

 mass of freestone, coals, iron ore, &c. which forms the east side of 

 Ballycastle Bay, and appears quite different from the common fossils 

 of the country, may be traced also directly opposite running under 

 Raghery, with circumstances which almost demonstrably ascertain 

 them to be the same veins." Letters on the coast of Antrim, page 8. 



Prom the exact correspondence in structure between the opposite 

 points of coast upon this island and. the main, Mr. H. infers that 

 " Raghery standing as it were in the midst between this and the 

 Scottish coast may be the surviving fragment of a large tract of 

 country, which at some period of time has been buried in the 

 deep." 



The pebbles of sienite which are scattered over various parts of 

 this island, and must have travelled hither from Cushleak, concur to 

 prove the later formation of the channel now separating it from the 

 mainland. Dr. Mac Culloch observed appearances analogous to 

 these in the island of Staffa, and deduces from them the same con- 

 clusion. See Transactions of the Geological Society, Vol. II. 

 page 207. 



